You can look in their profile for contact info (which implies to my mind that contacting them is OK withing reason) or you can find another post by that user and write a comment.
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dmckeeJul 9 '10 at 0:57

That was my last comment to the post. When the normal diagnostics don't provide a lead and there is no clear avenue for developing an answer into something that might be worthwhile to somebody else some day, I delete my post.

I've been wondering lately whether it makes sense to get into these kind of one-on-one forum style questions. Sometimes there's a nugget, like the thread I linked to, but it is very rare. The odds of getting a helpful vote are also very slim. Having 200 answers with 0 upvotes is enough for my taste. Subtle hint: if you find somebody trying to be helpful, click that up-arrow to keep them interested in continuing to help you. The idea that somebody on the intertubes found your effort useful is a powerful motivator. That click doesn't cost anything.